V6 Suzuki outboard, V6 Yamaha outboard, mercury V6 outboard, mercury alpha or bravo 1 will all physically fit.
As for pitch size, I can't advise you but there should be a number on your old prop. I think it is on the hub between the blades. Remember that a 3 blade prop will need to be 1 or 2 inches more pitch to get the same speed. My 9 meter with twin 421's has 21 inch pitch I think. With one engine, maybe you need a 19 or less.
Over propping, too high a pitch, can melt a piston or 2 so whatever prop you get just make sure you can get max rpm when fully loaded.
There is a whole science to props depending on if your boat needs lift in the back or not and how you use your boat as well as what height your sterndrive has been set at.
In my opinion the standard Hydradrive props are a pretty good option.